handcannon, Resident Evil 4, video game, unlockable weapon, high firepower, defeating enemies, completing challenges, Mercenaries mode, high scores, all stages, 5-star rating, every character, reward, in-game achievement, gaming strategy, action, horror, detailed texture, realistic metal finish, iconic design, ammunition, powerful shots, gaming environment, intense gameplay, strategic use, player skill, game progression, unlockable content, special item, gaming reward system, achievement trophy.